Drop hammer



May 13, 1941. A. T. MURRAY 2,241,737

DRQP HAMMER Filed Aug. 21, 1939 2 Sheets-Sheet 1 INVE NTO R ARTHURTMl/RRA Y ATTOR EYS y 1941- A. T. MURRAY 2,241,787

DROP HAMMER Filed Aug. 21, 1939 2 Sheets-Sheet 2 INVENTOR ARTHUR T/WuRRA7 BY ATTORN YS Patented May 13, 1941 DROP HAMMER 7 Arthur T. Murray,Springfield, Mass., assignor to Moore Drop Forging Company,

Springfield,

Mass, a corporation of Massachusetts Application August 21. 1939, SerialNo. 291,151

3 Claims. 1 (01. 78-25) This invention relates to drop hammers, and hasparticular reference to improvements therein in the matter oflengthening the life of the machine parts and facilitating and improvingthe accuracy of the adjustment of the registration between the hammerand the anvil.

In accordance with the invention the anvil is provided with a pair ofvertical guides, each adjustable in two directions at right angles toeach other. The hammer operating mechanism is carried in a frame havinga massive foundation entirely separate from that of the anvil. By havingthe guides carried solely by the anvilthey function to guide the hammervertically into. eX- act registration without. reference to any strainsthat may be imposed upon the hammer actuating mechanism. Conversely, thecolumns supporting the super-structure which carries the hammeroperating mechanism are free from all vibrations resulting from theimpact of the hammer on the anvil, and the crystallization of the metalin these columns, which has hitherto been a serious cause of fracture,is avoided.

The manner in which these objects are accom plished will be understoodbest by references to the accompanying drawings, in which:

Fig. 1 is an elevation, partly broken away in median section, of a drophammer constructed in accordance with my invention;

Fig. 2 is a sectional detail, on a horizontal plane, of the adjustingmechanism for the hammer guides;

Fig. 3 is a section on line 33 of Fig. 1;

Fig. 4 is a section on line 4-4 of Fig. 2; and

Fig. 5 is a side view of the hammer shown in Fig. 1, partly broken awayin median section.

The hammer l may be carried by a strap or board I which is operated bysuitable mechanism 9 contained in a super-structure l2. The mechanismmay be of any desired type, and it is not necessary to illustrate ithere. The super-structure is carried upon vertical frames or columns |3supported in foundations |4 preferably extending a substantial distancebelow the ground level l5. These foundations are entirely separate froman intermediate foundation l6 which supports the anvil II. By making thefoundations individually massive and separate one from another,transmission of vibration between them will be greatly reduced from thatwhich would occur were the foundations to be formed in one piece. Thecolumns l3 are thus free from the vibrations set up by the shock causedby the hammer striking the anvil. In prior installations, in which thecolumns I3 arose directly from the anvil, the'transmission of vibrationsthrough the column from the anvil to the superstructure and back againby reflection has been a serious cause of strain on the columns,leadingto crystallization and final fracture. By having the anvil and thecolumns each terminating in a separate massive foundation, the free flowof vibrations between them is broken up.

The foundation H is formed with a cross guideway upon which blocks 2|may slide. Each block 2| is provided with a guideway 22 (Figs. 1 and 4)at right angles to the guideway 29. Slidable in the guideway 22 is aplate 23 supporting vertical channels 24. Each channel is held to itsplate 23 by an. angle 25 to which it is secured as by smaller angles 26riveted in place. Each channel has riveted to it at 21 a plate 28 towhich is removably secured, as by bolts 29, a plate 30 having a groove3| formed in its surface and preferably keyed to the plate 28 at 32. Thegroove 3| operates as a vertical slideway for the hammer l9, and thepurpose of making the guide plate 30 removable is to avoid the necessityof replacing the entire channel structure in case the guide becomes soworn that it becomes necessary to replace it.

For moving the blocks 2| on the guideway 29 a screw is threaded througha vertical extension 36 of the base l6 and has a thrust bearing 31engaging the side of the channel or other part coupled to the blocks.The screw also has an enlargement 38 provided with one or moretransverse holes for the reception of a bar by which the screw may beturned. A similar screw 39 is threaded through a block 40 arising fromthe block 2|. Bolts 4| extending through slots 42 in the plates 23 and25 and similar bolts 43 passing through slots 44 in the plate 23 arethreaded into the blocks 2|. When the bolts are loosened, the twocolumns may be moved toward and from each other by the screws 39 and,when the desired adjustment has been reached, may be held permanently bytightening down the bolts 4| and 43. Bolts 45 pass through slots 46 inthe plate 23 and the block 2| and are threaded into the anvil. Theseslots extend at right angles to the slots 42 and 44 and permit thelateral adjustment of the columns by the screws 35.

At their upper ends the columns 24 are joined to horizontal channelmembers 50 by means of bolts 5| passing through slots 52 to permit thechannels being loosened during adjustment and tightened subsequently.

The columns I3 may, if desired, be mounted on guideways 55 and 55 atright angles to each other 'isthe shank 64 of a heavy weight 65.

in the same manner as channels 54. The same necessity for accurateadjustment is not here present, however, and in general it will not benecessary to provide adjusting screws. Since the construction of themounting for the columns l3 may be the same as that provided for thehammer guides it has not been shown in detail.

In Fig. 5.is shown a detail of the hammer structure which is ofconsiderable value in permitting adjustment of the hammer blow fordifierent types of work and in compensating for the loss of metaloccasioned by the necessity of trimming down the hammer after extendeduse in order .to keep its surface in shape. The board H is secured to awrist .pin 65] turning freely on apintl'e Bl which itself may turn in abushing fiz. ina hole extending laterally through the hammer. A taperedhole 63 is formed vertically in theupper part of the hammer, preferablytraversing .the bushing 62. Fitting within each vertical hole 63 Whenthe weight is in'positi'onfit'forms a stop for the ends of .the pintle BI ,.so .that'no extra .mechanismneed be employed to keep the 'pintl'e inposition. A

threaded hole :66 :is provided in the ..hammer be- .low the ishanks '54:so that by'inserting iaathreaded .rodiinieachlhol'e .65 the weights maybe forced out of wedging contactwith'the'rtaperedhole. .It'will beunderstood that the wei'ghts'm'ay .belrepla'ced as desired .for theadjustment of the Weight of the hammer either for particular classes ofwork or to compensate ;for Wear. When ionce placed zin position :theweights wedge themselves firmly in place IOHLthBTfiISt blowiof .thehammer andcannot work themselves loose.

.I claim:

1. In a drop hammer, an anviha massivefoum dation therefor, guidewaysextending vertically from the anvil, means permitting the adjustment ofeach guide in two directions at right angles to each other, a hammervertically slidable in said guides, means for operating the hammer, columns supporting said operating means, and massive foundations for saidcolumns mounted wholly independently .of said anvil foundation.

2. In a drop hammen an anvil, a massive foundation therefor, a pair ofguideways formed on the anvil one on either side thereof, a blockmovable in each of said guideways, a guideway formed in said block andextending in a direction transverse to the first mentioned guideway, aslide mounted in said second guideway, means for clamping said .slidesreleasably to the anvil, adjusting screws operable when said slides areunclamped to shiftthe slides accurately, a vertical hammer guidewaycarried by the second of said slides, a hammer reciprocably mounted insaid verticalrguideways, operating mechanism for said 'hammercolumns'for supporting said mechanism, and massive foundations for saidcolumns entirely separate from the anvil foundation.

'3. Inza .dropihammer, 'an anvil, a massive foundation therefor, .apairof vertical members sup- :ported from said fanvil for adjustment in twodirections atiright angles to each other, ahammer :guideway 'removablycarried by each of said members, :a hammer .re'ciprocably .mounted insaid ."gui'deways, operating mechanismfor the :hammer, *asuper-structure carrying said mechanism, columns supporting saidssuper-structure, and massivetfoundations :for said :columns entirelyseparate from said canvil foundation.

ARTHUR T. MURRAY.

